.w640 { width: 100%; margin-left: auto; margin-right: auto;}
@media only screen and (min-width: 640px) {
    .w640 { width: 640px;  }
}
.titleImg{
    width: 16rem;
}
.mainText{
    width: 11.25rem;
    margin-top: 1rem;
    margin-left: 2.45rem;
}
.mainText li{
    height: 1.2rem;
    text-align: center;
    font-size: 0.55rem;
    line-height: 1.2rem;
}
.mainText .titleText{
    height: 1.5rem;
    font-size: 0.675rem;
    line-height: 1.5rem;
}
.mainText .weixinID{
    height: 1.5rem;
    font-size: 0.6rem;
    margin-top: 1rem;
}
.mainText .weibo{
    height: 1.5rem;
    font-size: 0.6rem;
}
.mainText a{
    font-size: 0.6rem;
    color: #35c0da;
    text-decoration: underline;
}
.version{
    margin:1rem 0;
    color: #aeaeb0;
    text-decoration: underline;
}
.code{
    width: 8rem;
    height: 8rem;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -4rem;
    margin-top: -4rem;
    transform: scale(1.5);
    opacity: 0;
    transition: .4s all ease;
    z-index: 9;
}
.cover{
    width: 100%;
    height: 100%;
    background:rgba(0,0,0,0.5);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 8;
    display: none;
}
